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authorOhad Ben-Cohen <ohad@wizery.com>2011-09-27 07:36:40 -0400
committerJoerg Roedel <joerg.roedel@amd.com>2011-09-30 16:40:32 +0200
commit0ed6d2d27bcc2ace454a8c55446e1bc3efd2d529 (patch)
tree0ed0c8f9878ee5a921ab69131e38a45864e2498f /drivers/iommu/iommu.c
parent30bd918c7132adddd370c79fd5619bf108efd702 (diff)
downloadlwn-0ed6d2d27bcc2ace454a8c55446e1bc3efd2d529.tar.gz
lwn-0ed6d2d27bcc2ace454a8c55446e1bc3efd2d529.zip
iommu/core: let drivers know if an iommu fault handler isn't installed
Make report_iommu_fault() return -ENOSYS whenever an iommu fault handler isn't installed, so IOMMU drivers can then do their own platform-specific default behavior if they wanted. Fault handlers can still return -ENOSYS in case they want to elicit the default behavior of the IOMMU drivers. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu/iommu.c')
-rw-r--r--drivers/iommu/iommu.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3a072596b1b2..bd2d4d2764dd 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -43,6 +43,12 @@ EXPORT_SYMBOL_GPL(iommu_found);
* iommu_set_fault_handler() - set a fault handler for an iommu domain
* @domain: iommu domain
* @handler: fault handler
+ *
+ * This function should be used by IOMMU users which want to be notified
+ * whenever an IOMMU fault happens.
+ *
+ * The fault handler itself should return 0 on success, and an appropriate
+ * error code otherwise.
*/
void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler)